[SRU][F][PATCH 9/9] drm/i915/tc: Do not warn when aux power well of static TC ports timeout

[You-Sheng Yang]

From: José Roberto de Souza <jose.souza at intel.com>

BugLink: https://bugs.launchpad.net/bugs/1868936

This is a expected timeout of static TC ports not conneceted, so
not throwing warnings that would taint CI.

v3:
- moved checks to tc_phy_aux_timeout_expected()

v4:
- moved and add comments to tc_phy_aux_timeout_expected()

v5:
- only checking tc_legacy_port for TC ports

Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
Reviewed-by: Imre Deak <imre.deak at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200414194956.164323-8-jose.souza@intel.com
(backported from drm-tip commit 0f8925090ac7ad451ed9e803662ebe3214dc8072)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 .../drm/i915/display/intel_display_power.c    | 58 +++++++++++++------
 1 file changed, 41 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 34244c70dc3b..1c314615262e 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -20,6 +20,8 @@
 #include "intel_sideband.h"
 #include "intel_tc.h"
 
+static const struct i915_power_well_ops icl_tc_phy_aux_power_well_ops;
+
 bool intel_display_power_well_is_enabled(struct drm_i915_private *dev_priv,
 					 enum i915_power_well_id power_well_id);
 
@@ -298,6 +300,21 @@ static void hsw_power_well_pre_disable(struct drm_i915_private *dev_priv,
 		gen8_irq_power_well_pre_disable(dev_priv, irq_pipe_mask);
 }
 
+#define ICL_AUX_PW_TO_CH(pw_idx)	\
+	((pw_idx) - ICL_PW_CTL_IDX_AUX_A + AUX_CH_A)
+
+#define ICL_TBT_AUX_PW_TO_CH(pw_idx)	\
+	((pw_idx) - ICL_PW_CTL_IDX_AUX_TBT1 + AUX_CH_C)
+
+static enum aux_ch icl_tc_phy_aux_ch(struct drm_i915_private *dev_priv,
+				     struct i915_power_well *power_well)
+{
+	int pw_idx = power_well->desc->hsw.idx;
+
+	return power_well->desc->hsw.is_tc_tbt ? ICL_TBT_AUX_PW_TO_CH(pw_idx) :
+						 ICL_AUX_PW_TO_CH(pw_idx);
+}
+
 static struct intel_digital_port *
 aux_ch_to_digital_port(struct drm_i915_private *dev_priv,
 		       enum aux_ch aux_ch)
@@ -325,6 +342,28 @@ aux_ch_to_digital_port(struct drm_i915_private *dev_priv,
 	return dig_port;
 }
 
+static bool tc_phy_aux_timeout_expected(struct drm_i915_private *dev_priv,
+					struct i915_power_well *power_well)
+{
+	/* An AUX timeout is expected if the TBT DP tunnel is down. */
+	if (power_well->desc->hsw.is_tc_tbt)
+		return true;
+
+	/*
+	 * An AUX timeout is expected because we enable TC legacy port aux
+	 * to hold port out of TC cold
+	 */
+	if (INTEL_GEN(dev_priv) == 11 &&
+	    power_well->desc->ops == &icl_tc_phy_aux_power_well_ops) {
+		enum aux_ch aux_ch = icl_tc_phy_aux_ch(dev_priv, power_well);
+		struct intel_digital_port *dig_port = aux_ch_to_digital_port(dev_priv, aux_ch);
+
+		return dig_port->tc_legacy_port;
+	}
+
+	return false;
+}
+
 static void hsw_wait_for_power_well_enable(struct drm_i915_private *dev_priv,
 					   struct i915_power_well *power_well)
 {
@@ -337,8 +376,8 @@ static void hsw_wait_for_power_well_enable(struct drm_i915_private *dev_priv,
 		DRM_DEBUG_KMS("%s power well enable timeout\n",
 			      power_well->desc->name);
 
-		/* An AUX timeout is expected if the TBT DP tunnel is down. */
-		WARN_ON(!power_well->desc->hsw.is_tc_tbt);
+		WARN_ON(!tc_phy_aux_timeout_expected(dev_priv, power_well));
+
 	}
 }
 
@@ -531,21 +570,6 @@ icl_combo_phy_aux_power_well_disable(struct drm_i915_private *dev_priv,
 	hsw_wait_for_power_well_disable(dev_priv, power_well);
 }
 
-#define ICL_AUX_PW_TO_CH(pw_idx)	\
-	((pw_idx) - ICL_PW_CTL_IDX_AUX_A + AUX_CH_A)
-
-#define ICL_TBT_AUX_PW_TO_CH(pw_idx)	\
-	((pw_idx) - ICL_PW_CTL_IDX_AUX_TBT1 + AUX_CH_C)
-
-static enum aux_ch icl_tc_phy_aux_ch(struct drm_i915_private *dev_priv,
-				     struct i915_power_well *power_well)
-{
-	int pw_idx = power_well->desc->hsw.idx;
-
-	return power_well->desc->hsw.is_tc_tbt ? ICL_TBT_AUX_PW_TO_CH(pw_idx) :
-						 ICL_AUX_PW_TO_CH(pw_idx);
-}
-
 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_RUNTIME_PM)
 
 static u64 async_put_domains_mask(struct i915_power_domains *power_domains);
-- 
2.25.1